MitM attack in Heimdal

Published: 2019-05-16 | Updated: 2020-06-25
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2019-12098
Exploitation vector Network
Public exploit N/A
Vulnerable software
Server applications / Encryption software

Vendor Heimdal Software

Security Advisory

This security advisory describes one low risk vulnerability.

1) Key management errors

Risk: Low

CVSSv3.1: 4.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C] [PCI]

CVE-ID: CVE-2019-12098

CWE-ID: CWE-320 - Key Management Errors

Exploit availability: No


The vulnerability allows a remote attacker to perform a Man-in-the-Middle (MitM) attack.

The vulnerability exists due to Heimdal fails to verify anonymous PKINIT PA-PKINIT-KX key exchange within the krb5_init_creds_step() function in lib/krb5/init_creds_pw.c. A remote attacker can perform a MitM attack against the Heimdal client.


Install updates from vendor's website.

Vulnerable software versions

heimdal: 7.0.1, 7.0.2, 7.0.3, 7.1.0, 7.2.0, 7.3.0, 7.4.0, 7.5.0

CPE External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.